JPH09210498A - Absorption air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the frequency of error stopping operation in cooling or high temperature heating operation and perform a smooth start-up of a cooling operation by a method wherein in the case when a temperature in a regenerating device is higher than a first predetermined value and a temperature increasing speed is higher than a predetermined value, a control device temporarily stops an operation of a heating source and after this, it restarts the operation. SOLUTION: An absorption air conditioner A is operated such that when a cooling operation is started with a high temperature regenerating device 3 being at most 50 deg.C, the high temperature regenerating device 3 is at least 160 deg.C, for example, and when a fast increasing of temperature of the high temperature regenerator is found, it is deemed that this is a poor circulation caused by cold starting in operation and in turn a combustion at the gas burner 311 is stopped once until a temperature of the high temperature regenerator device is decreased to 150 deg.C or lower. With such an arrangement as above, when poor circulation is generated and no absorbing liquid is fed into the high temperature regenerating device 3, the heating operation is stopped, resulting in that the temperature within the high temperature regenerator device 3 is not increased, but the absorbing liquid returns back into the absorbing device 7 during stopped state of combustion and the heating is started again, and so a stopping in cooling caused by high temperature error can be avoided and a cold raising in cooling operation can be performed smoothly.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an absorption type air conditioner using an absorption liquid.

[0002]

2. Description of the Related Art An outdoor heat exchanger provided with an outdoor fan, an absorber heat transfer tube, and a condenser heat transfer tube are annularly connected in order, and a cooling water circuit for circulating cooling water by a cooling water pump during cooling operation, An indoor heat exchanger equipped with a blower fan and an evaporator heat transfer tube are connected in a ring. A hot / cold water circuit that circulates cold / hot water by a cold / hot water pump, an absorption liquid is put in, and the heating section is heated by a heating source to perform cooling operation. Sometimes a regenerator that vaporizes the refrigerant in the low-concentration absorption liquid to separate it into a high-concentration absorption liquid and a vapor refrigerant, the condenser heat transfer tube is arranged, and a condenser into which a high-temperature vapor refrigerant is sent from the regenerator during cooling operation. An evaporator that evaporates the liquid refrigerant liquefied in the condenser during the cooling operation by sending a high-temperature absorption liquid from the regenerator during the heating operation; An absorber that absorbs the vapor refrigerant evaporated in the evaporator into the high-concentration absorption liquid sent from the regenerator, and an absorption liquid circuit having a solution pump that returns the absorption liquid in the absorber to the regenerator, and during cooling operation , The rotation speed of the outdoor fan is controlled so that the temperature of the cooling water supplied to the absorber heat transfer tube is maintained at a predetermined temperature (for example, 31.5 ° C.), and the temperature of the outdoor heat exchanger is supplied to the indoor heat exchanger. The heating power of the heating source is proportionally controlled so that the temperature of cold / hot water is maintained at a set temperature (for example, 7 ° C.) (for example, 1500 kc).
Recently, an absorption air conditioner that does not use chlorofluorocarbon has been attracting attention, which has an air conditioner (al.about.4800 kcal) controller, and cools or warms the room by blowing cold air or warm air into the room by the air blowing fan.

In this absorption type air conditioner, in order to prevent overheating,
When the temperature inside the regenerator becomes 175 ℃ or higher, it will stop abnormally.
The cooling high temperature error stop processing was being performed. When the cooling high temperature error is stopped, it is necessary to turn off the power switch once to release the error and then turn on the cooling operation switch again to restart the cooling operation, which is troublesome.

By the way, in this absorption type air conditioner, especially when the cooling operation is started from a cold state (cold start), it takes time for the temperature of each part to reach a steady temperature, and the absorption liquid is circulated. Since a sufficient pressure difference is not immediately generated, the absorption liquid does not reach the absorber and the absorption liquid cannot be sent to the regenerator temporarily (when the outside temperature is not high, the generation degree is further increased). high). in this case,
The regenerator is temporarily put in an empty state, and the temperature inside the regenerator becomes 175 ° C or higher.

As a result of repeated test operations, there may be a case where the cooling high temperature error is stopped due to the above-described cause, which causes a temporary dry heating state, and a case where the abnormal heating causes a dry heating state. found.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an absorption type air conditioner which can reduce the number of times of cooling high temperature error stop and can smoothly start up the cooling operation.

[0007]

In order to solve the above problems, the present invention employs the following constitution. (1) An outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in an annular shape, and a cooling water circuit that circulates cooling water by a cooling water pump during cooling operation, an indoor heat exchanger, and evaporation. A hot and cold water circuit in which heat transfer pipes are connected in a ring, and cold and hot water is circulated by a hot and cold water pump, and a regenerator that vaporizes the refrigerant in the absorbing liquid during heating operation by heating the heating unit with the absorption liquid filled with the absorption liquid A condenser to which a high temperature vapor refrigerant is fed from the regenerator during the cooling operation by disposing the condenser heat transfer tube; an evaporator for evaporating the liquid refrigerant liquefied in the condenser during the cooling operation; An absorber for absorbing the vapor refrigerant evaporated in the evaporator in the concentrated absorption liquid sent from the regenerator during the cooling operation by disposing the absorber heat transfer tube, and a solution for returning the absorption liquid in the absorber to the regenerator. Pump In the absorption type air conditioner having an absorbing liquid circuit for controlling the heating source and the solution pump, the temperature in the regenerator is equal to or higher than a first predetermined temperature, and the temperature rising rate in the regenerator is When the value is equal to or larger than the predetermined value, the controller temporarily stops the operation of the heating source and then restarts the operation of the heating source.

(2) A cooling water circuit in which an outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in an annular shape, and cooling water is circulated by a cooling water pump during cooling operation.
The indoor heat exchanger and the evaporator heat transfer pipe are connected in a ring.
A hot and cold water circuit that circulates cold and hot water with a cold and hot water pump,
A high-temperature regenerator that contains the absorbing liquid and is heated by the heating source by the heating source to vaporize the refrigerant in the low-concentration absorbing liquid during cooling operation to separate the medium-concentration absorbing liquid and the vapor refrigerant, surrounding the high-temperature regenerator, A low-temperature regenerator that separates the medium-concentration absorption liquid into a high-concentration absorption liquid and a vapor refrigerant during cooling operation, a condenser into which high-temperature vapor refrigerant is fed from each regenerator when the condenser heat transfer tube is provided and during cooling operation, An evaporator that evaporates the liquid refrigerant liquefied in the condenser during the cooling operation, and the absorber heat transfer tube that is attached to the evaporator is installed, and the vapor refrigerant evaporated in the evaporator is sent from the low temperature regenerator during the cooling operation. An absorber that absorbs a high-concentration absorbent that is absorbed, and an absorbent circuit that has a solution pump that returns the absorbent in the absorber to the high-temperature regenerator;
In an absorption type air conditioner having the heating source and a controller for controlling the solution pump, the temperature inside the high temperature regenerator is equal to or higher than a first predetermined temperature, and the temperature rising rate inside the high temperature regenerator is equal to or higher than a predetermined value. In this case, the controller temporarily stops the operation of the heating source and then restarts the operation of the heating source.

(3) In the constitution of (1) or (2) above, after the operation of the heating source is restarted, the temperature inside the regenerator or the high temperature regenerator is equal to or higher than a first predetermined temperature, and If the rate of temperature rise in the regenerator or high temperature regenerator is above a certain value,
The controller stops operation.

(4) When the temperature of the regenerator or the high temperature regenerator is equal to or higher than a first predetermined temperature and the temperature rising rate is equal to or higher than a predetermined value, which has the configuration of (1) or (2) above. The controller temporarily suspends the operation of the heating source until the temperature in the regenerator or the high temperature regenerator falls to a second predetermined temperature lower than the first predetermined temperature.

(5) When the temperature of the regenerator or the high temperature regenerator is equal to or higher than a first predetermined temperature and the temperature rising rate is equal to or higher than a predetermined value, it has the configuration of (1) or (2) above. , The controller, during a predetermined time set by the pause timer,
The operation of the heating source is temporarily stopped.

(6) In any one of the above (1) to (5), the first predetermined temperature is a temperature in a substantially equilibrium state corresponding to the heating amount of the heating source during steady operation. .

[0013]

[Action]

[Cooling Operation of Claim 1] (Normal) The heating source heats the heating portion, and a part of the absorbing liquid put in the regenerator is vaporized to become a vapor refrigerant, which is sent to the condenser. During the cooling operation, since the cooling water is flowing through the condenser heat transfer tube, the vapor refrigerant is liquefied and accumulated in the condenser.

During the cooling operation, the liquid refrigerant sent from the condenser into the evaporator is sprayed on the evaporator heat transfer tubes through which the cold and hot water flows, and the heat of vaporization is removed to evaporate to cool the hot and cold water. Then, the cooled cold / hot water passes through the indoor heat exchanger, and indoor cooling is performed. Further, during the cooling operation, the vapor refrigerant evaporated in the evaporator and entering the absorber is absorbed by the high-concentration absorption liquid sent from the regenerator, and becomes the low-concentration absorption liquid and is accumulated in the absorber. The low-concentration absorption liquid accumulated in the absorber is returned to the regenerator by the solution pump.

(At the time of poor circulation) At the start of the cooling operation, especially when the temperature of the absorbing liquid in the regenerator is low and the startup is performed in a state where the outside air temperature is low, it takes time for the temperature of each part to reach the steady temperature. When the pressure difference is not enough to cause the absorption liquid to circulate, the absorption liquid does not reach the absorber and the state where the absorption liquid cannot be sent to the regenerator temporarily occurs. In this case, the regenerator will be cooked empty and the temperature inside the regenerator will be the first
When the temperature is equal to or higher than the predetermined temperature, the temperature inside the regenerator rises at a high speed (a predetermined value or higher).

In this case, the controller temporarily stops the operation of the heating source and waits. During standby, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbing liquid, so that the absorbing liquid reaches the absorber and is transferred to the regenerator by the solution pump. When the absorbent is accumulated in the regenerator and the empty heating state is eliminated, the operation of the heating source is restarted.

[Cooling Operation of Claim 2] (Normally) In the high temperature regenerator containing the absorbing liquid, the heating portion is heated by the heating source. During the cooling operation, the refrigerant in the low-concentration absorbent is vaporized and separated into the medium-concentration absorbent and the vapor refrigerant. During the cooling operation, high-temperature vapor refrigerant is sent from each regenerator to the condenser.

During the cooling operation, the liquid refrigerant sent from the condenser to the evaporator is sprinkled on the evaporator heat transfer tube through which the cold and warm water flows, and the heat of vaporization is removed to evaporate to cool the cold and warm water. And
The cooled cold / hot water passes through the indoor heat exchanger, and indoor cooling is performed. Further, during the cooling operation, the vapor refrigerant evaporated in the evaporator and entering the absorber is absorbed by the high-concentration absorption liquid sent from the low-temperature regenerator, and becomes the low-concentration absorption liquid and accumulates in the absorber. The low-concentration absorption liquid accumulated in the absorber is returned to the high temperature regenerator by the solution pump.

(At the time of poor circulation) At the time of starting the cooling operation, especially when the temperature of the absorbing liquid in the high temperature regenerator is low and the startup is performed in a state where the outside air temperature is low, the temperature of each part reaches the steady temperature. If it takes time and a sufficient pressure difference to circulate the absorbing liquid does not occur, the absorbing liquid does not reach the absorber and the state in which the absorbing liquid cannot be sent to the high temperature regenerator temporarily occurs.
In this case, the high temperature regenerator is cooked in an empty state, and the temperature inside the high temperature regenerator rises at a high speed (above a predetermined value) while the temperature inside the high temperature regenerator is at or above the first predetermined temperature.

In this case, the controller temporarily stops the operation of the heating source and waits. During standby, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbing liquid, so that the absorbing liquid reaches the absorber and is transferred to the high temperature regenerator by the solution pump. Absorption liquid accumulates in the high temperature regenerator,
When the empty heating state is eliminated, the operation of the heating source is restarted.

[Claim 3] After the operation of the heating source is restarted, if the temperature inside the regenerator or the high temperature regenerator is equal to or higher than the first predetermined temperature and the temperature rises quickly (above the predetermined value), There are other possible causes for overheating, so operation is stopped.

[Claim 4] At the start of the cooling operation, particularly when the temperature of the absorbing liquid in the regenerator or the high-temperature regenerator is low and the startup is performed in a state where the outside air temperature is low, the temperature of each part is a steady temperature. Takes a long time to reach, and if there is not enough pressure difference to circulate the absorbent, the absorbent does not reach the absorber and cannot be sent to the regenerator or high temperature regenerator temporarily. A condition occurs. In this case, the regenerator or the high-temperature regenerator is in an empty state, the temperature inside the regenerator or the high-temperature regenerator is equal to or higher than the first predetermined temperature, and the regenerator or the high-temperature regenerator The temperature rises.

In this case, the controller temporarily suspends the operation of the heating source until the temperature inside the regenerator or the high temperature regenerator falls to the second predetermined temperature lower than the first predetermined temperature. During the suspension, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbent, so the absorbent reaches the absorber and is transferred to the regenerator or high temperature regenerator by the solution pump. It When the temperature inside the regenerator or the high temperature regenerator has dropped to the second predetermined temperature, the absorbent has already accumulated in the regenerator or the high temperature regenerator, and the empty heating state has been resolved. Restart operation.

[Claim 5] At the start of the cooling operation, in particular, when the temperature of the absorbing liquid in the regenerator or the high temperature regenerator is low and the startup is performed in a state where the outside air temperature is low, the temperature of each part is a steady temperature. Takes a long time to reach, and if there is not enough pressure difference to circulate the absorbent, the absorbent does not reach the absorber and cannot be sent to the regenerator or high temperature regenerator temporarily. A condition occurs. In this case, the regenerator or the high temperature regenerator is in an empty state, and the temperature inside the regenerator or the high temperature regenerator is equal to or higher than the first predetermined temperature, and the regenerator or the high temperature regenerator is operated at a high speed (a predetermined value or higher). The temperature rises.

In this case, the controller temporarily stops the operation of the heating source for the predetermined time set by the temporary stop timer. During the suspension, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbent, so the absorbent reaches the absorber and is transferred to the regenerator or high temperature regenerator by the solution pump. It When the suspension timer times out, the absorbent has already accumulated in the regenerator or the high-temperature regenerator, and the dry heating state has been resolved. Therefore, the controller restarts the operation of the heating source.

[Claim 6] The first predetermined temperature at which the operation of the heating source is temporarily stopped is set to a temperature in a substantially equilibrium state corresponding to the heating amount of the heating source during steady operation.

[0027]

【The invention's effect】

[Claim 1] When the temperature of the regenerator is equal to or higher than the first predetermined temperature at the start of the cooling operation, and the rate of temperature increase in the regenerator is equal to or higher than the predetermined value, it is considered that the reheating is in an empty state. The controller temporarily stops the operation of the heating source. As a result, the temperature rise in the regenerator is temporarily suppressed, so that the cooling high temperature error stop can be avoided and the cooling operation can be started up smoothly.

[Claim 2] When the cooling operation is started up, when the temperature of the high temperature regenerator is equal to or higher than the first predetermined temperature and the temperature rising rate in the high temperature regenerator is equal to or higher than a predetermined value, the water heating is not performed. Considering the state, the controller temporarily stops the operation of the heating source. As a result, the temperature rise in the high temperature regenerator is temporarily suppressed, so that the cooling high temperature error stop can be avoided and the cooling operation can be started up smoothly.

[Claim 3] After the operation of the heating source is restarted, the temperature rising rate in the regenerator or the high temperature regenerator is a predetermined value when the temperature in the regenerator or the high temperature regenerator is equal to or higher than the first predetermined temperature. In the above case, since the controller is configured to stop the operation, it is possible to prevent overheating of the regenerator or the high temperature regenerator due to other causes.

[Claim 4] When the cooling operation is started, the temperature of the regenerator or the high temperature regenerator is equal to or higher than the first predetermined temperature, and the temperature rising speed in the regenerator or the high temperature regenerator is equal to or higher than a predetermined value. In this case, the controller is considered to be in an empty state, and the controller temporarily suspends the operation of the heating source until the temperature inside the regenerator or the high temperature regenerator falls to the second predetermined temperature. As a result, the temperature rise in the regenerator or the high temperature regenerator is temporarily stopped, so that it is possible to avoid the cooling high temperature error stop,
The cooling operation can be started up smoothly.

[Claim 5] When the cooling operation is started, the temperature of the regenerator or the high temperature regenerator is equal to or higher than the first predetermined temperature, and the temperature rising rate in the regenerator or the high temperature regenerator is equal to or higher than a predetermined value. In this case, the controller is considered to be in an empty state, and the controller temporarily suspends the operation of the heating source for a predetermined time set by the suspension timer. This allows
Since the temperature rise in the regenerator or the high temperature regenerator is temporarily stopped, the cooling high temperature error stop can be avoided and the cooling operation can be started up smoothly.

[Claim 6] The first predetermined temperature is set to a temperature in a substantially equilibrium state corresponding to the heating amount of the heating source during steady operation, and the temperature inside the regenerator or the high temperature regenerator is the first predetermined temperature. When the temperature increase rate is equal to or higher than the predetermined value, the configuration is considered to be the dry heating state, so that the dry heating state can be reliably detected.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention (claim 2,
(Corresponding to 3, 4, and 6) will be described with reference to FIGS. As shown in FIGS. 1 to 4, an absorption air conditioner A includes a cooling water circuit 1 that circulates cooling water 10 during a cooling operation, and a cooling and hot water circuit 2 that circulates cold and hot water 20 during a cooling / heating operation.
An absorbent liquid circuit 8 having a high temperature regenerator 3, a low temperature regenerator 4, a condenser 5, an evaporator 6, an absorber 7, and a solution pump 80, and a controller 9.

The cooling water circuit 1 includes a cooling tower 11 (outdoor heat exchanger) provided with a cooling tower fan 111, and a cooling water tank 1.
2, a cooling water pump 13, an absorber heat transfer tube 14, and a condenser heat transfer tube 15 are sequentially connected in an annular shape. During cooling operation, the cooling water pump 13 (1230 liters / h) is operated to remove the cooling water 10. Circulate.

The cooling tower fan 111 is driven by an AC condenser motor 112. The AC condenser motor 112 is connected to the AC-motor via a triac (not shown).
The rotation speed is controlled by the controller 9 so that the cooling water temperature detected by the cooling water temperature sensor 91 is maintained at 31.5 ° C.

The cooling water temperature sensor 91 is provided in the cooling water pipe 101 connecting the cooling water pump 13 and the absorber heat transfer pipe 14, and the cooling water 10 supplied to the absorber heat transfer pipe 14 is connected.
Detect the temperature of Also, during heating operation, the cooling water circuit 1
All the cooling water 10 inside is drained and the AC condenser motor 1
12 is not energized.

The cold / hot water circuit 2 is formed by annularly connecting an indoor heat exchanger 21 provided with a blower fan 211, a cistern 22, a cold / hot water pump 23 (620 l / h at maximum capacity), and an evaporator heat transfer tube 24. The cold / hot water 20 is circulated by the cold / hot water pump 23. The heat absorption amount of the indoor heat exchanger 21 during the cooling operation is 4340 kcal (at the maximum capacity), and the heat radiation amount of the indoor heat exchanger 21 during the heating operation is 6200 kcal.
kcal (at maximum capacity).

The high temperature regenerator 3 is composed of a boiling device 31 for heating the absorbing liquid by the gas burner 311, a separating cylinder 32 standing upright from the boiling device 31, and a collecting container 33. During the cooling operation, the boiling device 31 is provided. Low-concentration absorption liquid (hereinafter dilute liquid 30
The refrigerant (water) contained in the 58% lithium bromide aqueous solution is evaporated to separate the medium-concentration absorbing liquid (hereinafter referred to as medium liquid 34; 60% lithium bromide aqueous solution) and the vapor refrigerant 35.

The gas burner 311 is of the Bunsen type,
Gas is supplied by a gas pipe 315 having gas solenoid valves 312 and 313 and a gas proportional valve 314 connected thereto.
The combustion air is supplied by 16 and burns. 321 is a gap for achieving heat insulation. Further, an HGE temperature sensor 301 for detecting the temperature of the high temperature regenerator 3 (the temperature of the dilute liquid 30) is provided at an appropriate position of the boiling device 31.

The cold / hot water sensor 201 is used for the indoor heat exchanger 21.
Is installed in the hot and cold water pipe 29 on the inlet side of the indoor heat exchanger 2
The temperature of the cold / hot water 20 supplied to 1 is detected.

During the cooling operation, the controller 9 controls the temperature (average temperature) of the cold / hot water 20 detected by the cold / hot water sensor 201 to 7
The input of the gas burner 311 is proportionally controlled (cooling proportional control) between 1500 kcal and 4800 kcal so that the temperature becomes 0 ° C. The input is set to 6500 kcal during turbo cooling operation.

During the heating operation, the controller 9 proportionally controls the input of the gas burner 311 between 1500 kcal and 8000 kcal so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 60 ° C. (heating). (Proportional control)
I do.

During the cooling operation, the cooling / heating switching valve 36 is closed, so that the medium liquid 34 (165 ° C.) is discharged from the medium liquid pipe 341 →
The high-temperature heat exchange flow path 342 is sent to the upper part of the low-temperature regenerator 4 via the middle liquid pipe 344 having the orifice 343.

The low-temperature regenerator 4 surrounds the collection container 33 of the high-temperature regenerator 3, and during the cooling operation, the medium liquid 34 receives heat from the collection container 33 and is heated. As a result, a part of the medium liquid 34 is vaporized and the high-concentration absorption liquid (hereinafter referred to as the concentrated liquid 41; 6
2% lithium bromide aqueous solution) and vapor refrigerant 42 are separated. Further, during the heating operation in which the cooling / heating switching valve 36 is opened, flow path resistance is generated in the medium liquid pipe 344 by the orifice 343, so that all the medium liquid 34 flows into the heating pipe 361 and is not sent to the low temperature regenerator 4.

In the condenser 5, vapor refrigerants 35 and 42 are sent from the high temperature regenerator 3 and the low temperature regenerator 4 to the condenser 5, and the vapor refrigerants 35 and 42 are cooled in the coiled condenser heat transfer tube 15. Liquid refrigerant (water) cooled by water 10 and liquefied
52 accumulates at the bottom of the condenser 5. In addition, temperature rise (37.5)
The cooling water 10 cooled in the cooling tower 11 (31.5 ° C.).
° C).

The evaporator 6 is a coiled evaporator heat transfer tube 24.
Is arranged. Since the cooling / heating switching valve 36 is opened during the heating operation, the high temperature absorbing liquid in the separation column 32 is sent to the evaporator 6 via the cooling / heating switching valve 36 → heating pipe 361. During the cooling operation, the liquid refrigerant 52 is
→ Refrigerant valve 54 → Sprayed on the evaporator heat transfer tube 24 via the sprayer 55, and the inside of the evaporator 6 is substantially vacuum (about 6.5 mmHg)
Therefore, the liquid refrigerant 52 deprives the heat of vaporization from the cold / hot water 20 flowing in the evaporator heat transfer tube 24 to evaporate. Then, the cooled cold / hot water 20 is supplied to the indoor heat exchanger 21 arranged indoors.
Exchanges heat with the air blown indoors (at maximum capacity, endothermic 4
000 kcal / h) to raise the temperature and raise the temperature of cold / hot water 20
Is again cooled by passing through the evaporator heat transfer tube 24.

The absorber 7 provided with the absorber heat transfer tube 14 is
It is attached to the evaporator 6, and the upper part communicates with the evaporator 6.
Then, during the cooling operation, the vapor refrigerant evaporated in the evaporator 6 enters the absorber 7 from above, and the low temperature regenerator 4 → the concentrated liquid pipe 411 → the low temperature heat exchange flow path 412 → the concentrated liquid pipe 413 → the sprinkler 70. The dilute liquid 30 which has been absorbed by the concentrated liquid 41 which has been sprayed onto the absorber heat transfer tube 14 and has a low concentration is collected at the bottom of the absorber 7. Further, during the heating operation, the high temperature absorbing liquid is sent from the evaporator 6.

The solution pump 80 is a three-phase DC brushless motor operating at AC-100V, and has a hall element (not shown) attached thereto. This solution pump 80
Is controlled in speed based on the HGE temperature-speed characteristic. The cold / hot water pump 23 and the solution pump 80 may be configured as a single tandem pump.

The dilute liquid 30 (absorption liquid during heating operation) accumulated at the bottom of the absorber 7 is diluted liquid pipe 71 → solution pump 80 →
Dilute liquid pipe 72 → Low temperature / high temperature heat exchange flow path 73 → Dilute liquid pipe 7
It is sent to the boiling device 31 of the high temperature regenerator 3 via 4.

The controller 9 includes an operation switch (not shown),
Each water level sensor, H for detecting the temperature of the absorbing liquid in the boiling device 31
The GE temperature sensor 301, the cold / hot water sensor 201 for detecting the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21, the EVA temperature sensor 61 for detecting the internal temperature of the evaporator 6, and the absorber heat transfer tube 14 are supplied. The following is controlled based on the signal from the cooling water temperature sensor 91 that detects the temperature of the cooling water 10.

Water supply valve 221, gas solenoid valves 312, 31
3, gas proportional valve 314, solution pump 80, cooling water pump 13, cooling tower fan 111, refrigerant valve 54, cooling / heating switching valve 3
6, cold and hot water pump 23.

During the cooling operation or the heating operation, the absorption air conditioner A operates as follows. In the high-temperature regenerator 3 containing the absorbing liquid, the boiler 31 is heated by the gas burner 311. During the cooling operation, the refrigerant in the dilute liquid 30 is vaporized and separated into the medium liquid 34 and the vapor refrigerant 35. During cooling operation (Fig. 4
In reference (1), the high temperature vapor refrigerants 35 and 42 are sent to the condenser 5 from the high temperature regenerator 3 and the low temperature regenerator 4.

The liquid refrigerant 52 sent from the condenser 5 to the evaporator 6 is sprinkled on the evaporator heat transfer tube 24 through which the cold / hot water 20 flows, takes the vaporization heat and evaporates, and the evaporated vapor refrigerant is absorbed by the absorber 7. The concentrated liquid 41 that enters the inside and is sent from the low temperature regenerator 4
Is absorbed in the absorber 7 and accumulated in the absorber 7 and returned to the boiling device 31 of the high temperature regenerator 3 by the solution pump 80.

When the liquid refrigerant evaporates on the evaporator heat transfer tube 24 through which the cold / hot water 20 flows, the cold / hot water 20 is cooled, the cooled cold / hot water 20 passes through the indoor heat exchanger 21, and the blower fan 211 is used. Indoor cooling is performed by blowing cold air into the room. At this time, the indoor controller 25 controls the flow rate adjusting valve 27 and the blower fan 211 so that the room temperature detected by the room temperature sensor 26 becomes the set room temperature set by the room temperature setting device (not shown).

During the cooling operation, the controller 9 controls the input of the gas burner 311 so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 7 ° C. In the heating operation, the high-temperature regenerator 3 is sent to the evaporator 6 from the high-temperature regenerator 3 via the heating pipe 361, and the absorption liquid heats the cold / hot water 20 flowing through the evaporator heat transfer pipe 24 to 6
The absorbing liquid therein enters the absorber 7 and accumulates in the absorber 7. The absorbed absorption liquid is returned to the high temperature regenerator 3 by the solution pump 80.

Cold / hot water 2 heated by the absorbing liquid to raise its temperature
0 passes through the indoor heat exchanger 21, and the blower fan 211 blows warm air into the room to heat the room. At this time, the controller 9 controls the gas burner 31 so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 60 ° C.
Control 1 input (1500-8000 kcal). Further, the indoor controller 25 controls the flow rate control valve 27 and the blower fan 211 so that the room temperature detected by the room temperature sensor 26 becomes the set room temperature set by the room temperature setting device (not shown).

Next, a mechanism for smoothly starting the cooling operation will be described with reference to the flowchart of FIG.
When the user turns on the cooling operation switch (not shown),
The controller 9 and the indoor controller 25 start the control according to a predetermined procedure.

Cold cooling start {Y in step s1
ES; HGE ≦ 50 ° C .; HGE is the temperature detected by the temperature sensor 301}, the water supply valve 221 is opened, and cooling tower processing (CT processing) is performed to store water in the cistern 22.
Is performed in step s2 (required time is about 1 minute), and the process proceeds to step s3.

Start hot cooling (N in step s1)
In the case of O; HGE> 50 ° C.), the water supply valve 221 is opened and the cooling tower process (CT process) for collecting water in the systern 22 is performed in step s11 (the required time is about 1).
Min), and proceeds to step s12.

At step s3, the solution pump is set to 2400 rp.
It rotates at m, the ignition operation is performed at step s4, and the gas burner 311 starts combustion. In step s5, cold start control (hot start control for the second time) described below is performed, and when the cooling operation is stable, the control proceeds to the cooling proportional control.

(Cold start control) HGE <60 ° C.
During that period, the input is 3500 kcal. When cold / hot water> 11 ° C. and 60 ° C. ≦ HGE <150 ° C., the turbo cooling operation is started and the input is set to 6500 kcal. When 80 ° C. ≦ HGE, the solution pump 80 is controlled with the rotation speed proportional to the input. 10 ℃ <Cold and hot water ≦ 11
℃, HGE ≧ 150 ℃, input 4800k
drop to cal. When the cooling operation becomes stable and the cold / hot water becomes ≦ 10 ° C. (however, HGE ≧ 150 ° C.), the control proceeds to the cooling proportional control.

(Hot start control) 10 ° C. <Cold / warm water input 4800 kcal. Cooling operation is stable, and cold / hot water ≤ 10 ° C (however, HGE ≥ 150 ° C)
Then, the control shifts to the cooling proportional control.

(Cooling proportional control) 1500 kcal to 4800 so that the temperature (average temperature) of the cold / hot water 20 becomes 7 ° C.
During kcal, the input of the gas burner 311 is proportionally controlled (cooling proportional control).

During the control of step s5, the conditions of step s6 (HGE ≧ 160 ° C., 2 ° C. or more for 3 seconds,
When the HGE temperature rises) (step s
If YES in step 6, the process proceeds to step s7, and if not satisfied (NO in step s6), the process returns to step s5 to continue cold start control (hot start control for the second time) or cooling proportional control.

If the condition in step s6 is satisfied for the second time (YES in step s7), the cooling high temperature error is stopped after performing the cooling high temperature error processing. If the condition in step s6 is satisfied for the first time (NO in step s7), the process proceeds to step s8. In step s8, the controller 9 gives an instruction to extinguish the gas burner 311. In step s9, the controller 9 causes the solution pump 80
Continue the operation of (rotational speed proportional to the input).

In step s10, it is judged whether or not HGE ≦ 150 ° C., and if HGE> 150 ° C., the process returns to step s9 and the extinguishing state is continued. In addition, the temperature of each part rises in the loop of NO → step s9 in step s9 → step s10, and a sufficient pressure difference for circulating the absorbent occurs and the absorbent reaches the absorber 7.
When HGE ≦ 150 ° C., the process returns to step s4,
Carry out the ignition operation.

On the other hand, in the case of hot cooling start, the ignition operation is performed in step s12, and the gas burner 311 starts combustion. In step s13, the hot start control described above is performed, and when the cooling operation is stable, the above-described cooling proportional control is performed.

Next, the advantages of the absorption air conditioner A of this embodiment will be described. [A] Absorption type air conditioner A has HGE ≧ 16 in the case of cold startup of cooling operation at HGE ≦ 50 ° C.
At 0 ℃, the HGE temperature rises quickly (2 ℃ in 3 seconds).
In the above case, it is considered that the circulation is defective due to cold start, and the combustion of the gas burner 311 is temporarily stopped until the temperature falls to HGE ≦ 150 ° C.

As a result, when the circulation failure occurs and the absorbing liquid is not sent into the high temperature regenerator 3, the heating is stopped, so that the temperature in the high temperature regenerator 3 does not rise and the gas burner 31
Since the absorbing liquid returns to the inside of the absorber 7 and the heating is restarted while the combustion of No. 1 is stopped, the cooling high temperature error stop can be avoided and the cold start of the cooling operation can be smoothly performed. It is particularly effective for cold start-up of the cooling operation when the outside air temperature is low, where the temperature of each part is unlikely to reach a steady state early.

[B] Absorption type air conditioner A includes a gas burner 3
After re-combustion of No. 11, in a state of HGE ≧ 160 ° C. or higher, if the HGE temperature rises quickly (2 ° C. or higher in 3 seconds), the cooling high temperature error is stopped (operation is stopped). Therefore, it is possible to reliably detect overheating of the high temperature regenerator 3 due to other causes (because only one heating operation due to cold start occurs), and in the case of overheating of the high temperature regenerator 3 due to other causes, combustion It is possible to safely stop the absorption air conditioner A without repeating the start / stop.

[C] Heating amount during steady operation (input)
In the equilibrium temperature corresponding to, that is, the first predetermined temperature is set to 160 ° C., the second predetermined temperature is set to 150 ° C., which is slightly lower than that, and the predetermined value of the fast rising rate of the HGE temperature is set to
Since it is said that the temperature is 2 ° C. or higher in 3 seconds, it is excellent in the accuracy of determination of the dry heating state due to cold start. Also, when the dry heating state is canceled and the absorbing liquid returns to the absorber 7 (150
The gas burner 311 can be reburned at (° C.), and cold air can be blown at an early stage.

The present invention includes the following embodiments in addition to the above embodiments. a. In the above-described embodiment, the absorbing liquid circuit 8 is provided with a regenerator in which the absorbing liquid is filled and the heating portion is heated by a heating source, and a condenser heat transfer tube is provided, and high-temperature vapor refrigerant is fed from the regenerator during cooling operation. A condenser, an evaporator that evaporates the liquid refrigerant liquefied in the condenser during the cooling operation, the absorber heat transfer tube provided in parallel with the evaporator, and the vapor refrigerant evaporated in the evaporator during the cooling operation is the regenerator. It may be configured by an absorber that absorbs the high-concentration absorption liquid sent from, and a solution pump that returns the absorption liquid in the absorber to the regenerator (corresponding to claim 1). In this way, if the absorbing liquid circuit 8 is made to have a single effect, the cooling and heating efficiency is lower than that of the double effect (absorption type air conditioner A), but the structure of the absorption type air conditioner can be simplified.

B. The second predetermined temperature is the second predetermined temperature <the first
Other temperatures may be used as long as they are predetermined temperatures. c. In the above example, also in the case of HGE> 50 ° C. hot start, similar to cold start {HGE ≧ 16.
At 0 ℃, the HGE temperature rises quickly (2 ℃ in 3 seconds).
In the above case, it is considered that the circulation is defective, and HGE ≦ 150.
The composition of once stopping the combustion of the gas burner 311 until the temperature drops to ℃} may be adopted.

D. The heating source may be an electric heater or the like other than the gas burner. e. The temporary heating stop may be performed for a predetermined time set by a temporary timer (corresponding to claim 5).

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of an absorption air conditioner according to one embodiment of the present invention.

FIG. 2 is a system diagram of the absorption type air conditioner.

FIG. 3 is an operation explanatory diagram when the absorption type air conditioner is operated for heating.

FIG. 4 is an operation explanatory diagram when the absorption air conditioner is operated in a cooling mode.

FIG. 5 is a flowchart showing a cooling operation of the absorption air conditioner.

[Explanation of symbols]

 A Absorption type air conditioner 1 Cooling water circuit 2 Cold / hot water circuit 3 High temperature regenerator 4 Low temperature regenerator 5 Condenser 6 Evaporator 7 Absorber 8 Absorbing liquid circuit 9 Controller 10 Cooling water 11 Cooling tower (outdoor heat exchanger) 13 Cooling water pump 14 Absorber heat transfer tube 15 Condenser heat transfer tube 20 Cold / hot water 21 Indoor heat exchanger 23 Cold / hot water pump 24 Evaporator heat transfer tube 30 Dilute liquid (low concentration absorption liquid) 31 Boiling device (heating part) 34 Medium liquid ( Medium-concentration absorption liquid) 35, 42 Vapor refrigerant 41 Concentrated liquid (high-concentration absorption liquid) 80 Solution pump 111 Cooling tower fan (outdoor fan) 211 Blower fan 311 Gas burner (heating source)

Front page continuation (72) Inventor Kaoru Kawamoto 4-1-2, Hirano-cho, Chuo-ku, Osaka City Osaka Gas Co., Ltd.

Claims (6)

[Claims] 1. A cooling water circuit, in which an outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube are annularly connected in sequence, and a cooling water pump circulates cooling water during cooling operation, and an indoor heat exchanger, And the evaporator heat transfer pipes are connected in a ring,
The hot and cold water circuit that circulates the hot and cold water by the hot and cold water pump, the regenerator that puts the absorbing liquid into the heating section and heats the heating part by the heating source, and vaporizes the refrigerant in the absorbing liquid during the cooling operation, and the condenser heat transfer tube are installed. A condenser to which a high-temperature vapor refrigerant is sent from the regenerator during cooling operation, an evaporator that evaporates the liquid refrigerant liquefied in the condenser during cooling operation, and an absorber heat transfer tube that is attached to the evaporator to provide cooling. During operation, an absorber that absorbs the vaporized refrigerant that has evaporated in the evaporator into the concentrated absorption liquid that is sent from the regenerator, and an absorption liquid circuit that has a solution pump that returns the absorption liquid in the absorber to the regenerator; In an absorption air conditioner having a source and a controller for controlling the solution pump, when the temperature in the regenerator is a first predetermined temperature or higher and the temperature rising rate in the regenerator is a predetermined value or higher, Your vessel, the operation of the heating source temporarily stopped, then, the absorption air conditioning apparatus, characterized in that to resume the operation of the heating source. 2. An outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in an annular shape, and a cooling water circuit for circulating cooling water by a cooling water pump during cooling operation, an indoor heat exchanger, And the evaporator heat transfer pipes are connected in a ring,
A hot / cold water circuit that circulates cold / hot water with a cold / hot water pump, and an absorption liquid is put in the heating part to heat the heating part by a heating source. A high-temperature regenerator to be separated, a low-temperature regenerator that surrounds the high-temperature regenerator, separates the medium-concentration absorption liquid into a high-concentration absorption liquid and a vapor refrigerant during cooling operation, and the condenser heat transfer tube is arranged to perform cooling operation. A condenser into which a high-temperature vapor refrigerant is sent from each regenerator, an evaporator that evaporates the liquid refrigerant liquefied by the condenser during cooling operation, and the absorber heat transfer tube that is attached to the evaporator and is disposed during cooling operation An absorber for absorbing the vapor refrigerant evaporated in the evaporator into the high-concentration absorption liquid sent from the low-temperature regenerator, and an absorption liquid circuit having a solution pump for returning the absorption liquid in the absorber to the high-temperature regenerator, and the heating Source and In the absorption type air conditioner having a controller for controlling the solution pump, when the temperature in the high temperature regenerator is a first predetermined temperature or higher and the temperature rising rate in the high temperature regenerator is a predetermined value or higher, the control is performed. An absorption type air conditioner, wherein the device temporarily stops the operation of the heating source and then restarts the operation of the heating source. 3. The temperature inside the regenerator or the high temperature regenerator is equal to or higher than a first predetermined temperature after the operation of the heating source is restarted,
The absorption type air conditioner according to claim 1 or 2, wherein when the temperature rising rate in the regenerator or the high temperature regenerator is equal to or higher than a predetermined value, the controller stops the operation. 4. The absorption type air conditioner according to claim 1 or 2, wherein the temperature in the regenerator or the high temperature regenerator is a first predetermined temperature or higher, and the temperature rising rate is a predetermined value or higher. In this case, the controller temporarily suspends the operation of the heating source until the temperature in the regenerator or the high temperature regenerator falls to a second predetermined temperature lower than the first predetermined temperature. Absorption type air conditioner. 5. The absorption air conditioner according to claim 1 or 2, wherein the temperature inside the regenerator or the high temperature regenerator is a first predetermined temperature or higher, and the temperature rising rate is a predetermined value or higher. In this case, the controller temporarily stops the operation of the heating source for a predetermined time set by a temporary stop timer. 6. The absorption type air conditioner according to claim 1, wherein the first predetermined temperature is a temperature in a substantially equilibrium state corresponding to the heating amount of the heating source during steady operation. Absorption type air conditioner that is characterized.